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| n | a(n) |
|---|---|
| 1 | 54 |
| 2 | 326 |
| 3 | 2516 |
| 4 | 19138 |
| 5 | 145682 |
| 6 | 1110752 |
| 7 | 8470018 |
| 8 | 64594290 |
| 9 | 492627324 |
| 10 | 3757052022 |
| 11 | 28653492802 |
| 12 | 218528696816 |
| 13 | 1666631440922 |
| 14 | 12710736921242 |
| 15 | 96939753662116 |
| 16 | 739321100203858 |
| 17 | 5638509196177426 |
| 18 | 43002676390969828 |
| 19 | 327964380966543498 |
[54,326,2516,19138,145682,1110752,8470018, 64594290,492627324,3757052022,28653492802, 218528696816,1666631440922,12710736921242, 96939753662116,739321100203858,5638509196177426, 43002676390969828,327964380966543498] |